A (flu vaccine) may be wined.Logical formLearned from22 sentences. A battle can be against flu.Logical formLearned from22 sentences. Persons may be infected with flu.Logical formLearned from22 sentences. Some (bird flu deaths) can be in a country.Logical formLearned from22 sentences. A total of some persons may die of (bird flu).Logical formLearned from22 sentences. Some human deaths can be from (bird flu).Logical formLearned from22 sentences. A (flu virus) can be virulent.Logical formLearned from22 sentences. A (bird flu conference) can be in a world-city.Logical formLearned from22 sentences. A flu may undergo a (death toll).Logical formLearned from21 sentences. Some persons may die from a flu.Logical formLearned from21 sentences. (Flu outbreaks) can be seasonal.Logical formLearned from21 sentences. Cases can be constituted-of-or-filled-with (bird flu infections).Logical formLearned from21 sentences. A (flu center) may pertain-to a ministry.Logical formLearned from21 sentences. An outbreak may pertain-to an (avian flu).Logical formLearned from21 sentences. A (bird flu) can be in a continent.Logical formLearned from21 sentences.